Double-acting sawmill.



BRIDGES. DOUBLE ACTING SAWMILL.

APPLICATION FILED 1130.21, 1909:

1,002,129, Patented Ang.29,1911.

' E Z ZBHEETFBEEBTL W. T. BRIDGES. DOUBLE ACTINGSAWMILL.

APPLIOATION FILED 1120.21, 1909.

PatenteEAug. 29, 1911..

2 BHEETS--8HEET 2.

Inventor: William ZZn'dyea.

UNITED ST TES...

rntrnn'r oFFIon WILLIAM '1. BRIDGES, OF LOS ANGELES, CALIFORNIA.

DOUBLE-ACTING SAWMILL.

Application filed December 21, 1909.

To (17! whom it may concern: lie it known that I, VVJLLIAM T. Bunions a citizen" of the United States, residing at Les Angelcs, in the county of Los Angcles and State of California, l'iaveinvented new and useful Improvements in'Doubleukcting Sawmills, of which the followlng 1s a spec1 fication. This invention relates to saw mills, and. the object of the invention is to produce a. saw mill constructed in such a way as to enable it to'operate upon a log or timber in dimensions both'saws may operate upon the 1 log simultaneously for the driving mechanism is such as to enable both saws to be continuously driven whatever he the position i of the rocking frame. The inventhm consists in the construction andcombination of parts to be more fully described hereinafter and particularly set forth in the cl aims.

, In the annexed'drawing which fully illustrates my invention, Figure 1 is afront e]e vation of afsaw mill constructed according f to my invention certain parts being broken away. This' view shows the rocking frame v in one of itsextreme positions so that the deft handsaw is presented to the log. Fig.

40 rocking frame in its mid position, certain I arts of the saw mill being broken away. Eig. 3 is a vertical section taken on the line 3"-"{-'3 of Fig. 2. and further illustrating details of the construction. Fig. t is avertical section taken on'the line ll- 1 of Fi 1 and articularly illustrating the means or supgtlitlllg an'd" guiding-the'edges of the saw. his View is upon an enlarged scale. Fig. averti'cal section taken on the line 5-5 of Fig. l'furth'er illustrating the means for "sup'porting'and guiding the saw-blades, and

also the means 0 r taklng the-thrust which saw guards. Fig. .is aside eleyation show Specification of Letters Patent.

. 2, is a plan of the saw mill but showing the the log exerts on the same Fi 6 is a sec- "ti'ongtaken 'onflthe' line 6-6 -0 Fig. 1 and *furtlier' 'illustratin the construction of the 1 Patented Aug. 29, 1911.

Serial No. 534,316.

ing :1 art of one of the'saws and particularly illustrating the construction 'of the saw guards. This View upon an enlarged scale. Fig. 8 is a section taken on the line 8.-8 of Fig. 1 and also illustrating further the construction the saw guards. This view is upon an enlarged scale: Referring more particularly to the drawmg, 9 represents the frame of the saw mill which is of substantially rectangular form in plan having a rear bar 10. a forward bar :11 and'intermediate brace bars 1-2 and 13. 'On the bars 10 and 12 upright bearing posts 14 and 15 are mounted and onthe bar 13 a bearing post 16 is mounted as indicated most clearly in Fig". 3. At this hearing post 16 'a guide ring 17 is mounted, the lower portion of which is attached rigidly to the frame 9 as indicated. The upper portion secured to the upper end of the post 16.

Rotatably mounted in the posts 14:, 15" and 16 isprovided a. rock shaft 18 and on this rock elicit a rocking frame 19 .isniounted.

This rocking frame comprises a rear cross head 20 which is disposed adjacent to the bearing post 14*. an intermediate cross head 21 adjacent to the bearing post lo' and'a guiding cross head having shoes 23 at the ends thereof which engage thein'ner edgeof the guide ring 17. The rocking frame- 19 is completed by two saw beams and which connect the cross heads 20, 21 and. These saw beams 24 and 25 extend parallel with the shaft 18 and in horizontal plane. The forward ends of the saw' beams 24: and 25 are formed into heads 20 which are elongated transversely of the beams and these heads 26 are provided on their outer sides with saw guards 27 which extend around.

the edges of the saws 28 and 29. The saws 28 and 29 are ot cir cular formf and are rigidly attached to spindles 3O rotat'ably mounted in the heads 26 and in the rear ends of the beams 2 1 and 25 as shown." These saw guards. 27 comprise.removable plates of se 31 however, are not. removable but simply form a guard. for-the; inner sidesof the saw blades. 281anid 29 These. guard plates-,2? and 31 have are shaped rims winch erwelop [the rim-of the sanv so-as to-form a guardjfor "the teeth'oiithe'sawitor a &part of the; circumference of the saw as indicated. Each inner 'the' saw blade so as to guard plate 31 is )rovided with a pivot ,bolt 32, and the guard plate 27 may be swun outwardly on this pivot bolt to permit the saw to be removed.

Normally the uard plate 27 is rigidly held in position by means'of a fastening bolt 33 which is carried by the guard plate 27 and is secured in the'bolt opening 34 in the inner guard plate as indicated in Fig. 6. As indicated also in Fig. 6 the adjacent facts of the guard plates 27 and 31 are cut away or formed with recesses 35 for the sawblade and at suitable points bosses 36 are formed which touch the side of the saw and guide it, as will be readily understood;

'In addition to this, as indicated in Fig. 8 'at another point I provide oppositely disposed set screws 37 which are mounted respectively in thegua'rd' plates 27 and 31 and the points'of these set screws touch the sides of guide the saw as will be readily understood. r

I t should be seen that the rocking frame,

wl'ien the' saw mill is in operation, occupies ganinelined position as lndicated 1n Flg. 1

with the left saw 28 depressed, or it may occupy an opposite position with the saw 29 depressed. lVhen the rocking frame is in posit on as shown in Fig.1, the upper portions of the guard plates 27 and 31'seat in a saw bracketiiS which forms a sockct'BE) having tapered: side faces 40/ This socket 3!) is formed by means ofalongitudinal tongue 4] which projects inwardly toward the com tral' axis of thedevice from the' side; At the point where the guard plates27'and 31 are received in the socket 39, they present tapered siile faces corres 'mmling to thetapercd sid.e"faces40. In this way a tapered shoe 4-l. is formed which 'tits'in thetapered Socket an(l r.igi(lly holds thefsaw guard in. posiIionQ \Vhcn' the 'i'ocl'ing. frame is in this position, the head 20 is resting upon a block or rcst 42 which is mounted upon the i at side of the f()lf\\",: l.-1(.l cross bar l of oif ,thiscross bar l l, a thrust block 1 M. and. adjacent. to the heads LG qifrarnc'is 'lormed"with do wn-' \x'lendingfoot. which thrusts rtii::a.l .Jace-ofi this block .43 as lfli l'n th 'is way l form a, seatri l'he ,hjcadS QG and- I"il l$(l'.])l'i) *absm the .il-n'nst force which isby thering .npon. the saw blade. and -4;} are" dnpl icat ed. on each, 'de 0 1h Jitral lxis oflhesflw mill is i ilicated, f ttncaththe foot 44springs I qfllttt'ltltfd whi ch absm'bthe' shock of tl'lI-EZHVlI lg .theyrorking frame .firmzuonc: e-x-. l l.'(l'Jl(".;- position toi-t hc other. In. .ordcluto shi H illip-lflflk-lllfl frame-in the manner sugnes h T ').ro -\"id egtognl-c;..linl' i and 4-7 v l at the rig'l )f. the saw exert ed press'ed air, steam or' similar means.

frameO. ,In addition. to this, on the I I readily understood.

'l together by a pivot" pin' 48. The links 4.6 arepivotally attached to the intermediate cross head 21 by pivot bolts 49. The lower end of the link 47 is attached by a pivot bolt 50 to the frame 9, and rigidly attached to the lower end of this link I provide asegmcnt 51. ()n the opposite side of the central axis of the saw mill a similar construction is provided comprising a toggle link 52 pivotally attached at. to the cross head 21, and this link 52 is connected by a pivot bolt 54 with a toggle link 55. The lower end of the toggle link 55 is attached by a pivotbolt 56 to the frame 9 and it carries rigidly'a. seginent 57 similar to the segment 51. Mounted to slide transversely of the central axis of the saw mill and on the under side of t-h'e frame 9 I provide a rack 58 having rack teeth 59 and (30 which are adapted to mesh respectii'ely withthe segments 51 and 57. This rack 58 is formed at its left end into a pis' ton rod (1-1 which extends into a cylinder (32 which enables the rack to be shifted by com- The ends of this rack are suitably supported in guide brackets In order to enable the saws to be driven continuously inleither of the extreme positions'of the rocking frame 19 I provide a horizontal driving shaft (34 which is pro vidcd with a bevel gear": wheel 65 meshing n-"ith a corresponding bevel gear wheel 66; ".lhi's 'bevcligear wheel 66 is attached to the lower cnd 30f a vertical counter-shafti 67 which extendsupwardly in a'suitable guide 68. y it its upper end the shaft 67 is provided with abevcl gear 69 This bevel gear meshes with a pair of bevel gears 70 and 7L mounted loosely on the shaft 18. Rigid with, the/bevel gear 70 1 provide a belt pulley 72 and a similar bcltpulloy 73 is rigid with the bevel gear 71. From the belt pulleys 7s a1t l73 bolts 74 and 75 ektend' respectively and V these bolts 74 and 75' run over belt j'iulleys 70 which are rigidly attached "to. the saw spindlcsffitl as will be mcnt. it willbe'sccn that when the sha ft tri From this arrangeis rotated thesaws will be .driycn in opposite directions. I n connection with the belts 74- andj.7= I provide belt t ghteners 77. Each of these belt tlghtenc-rs comprises an arm 78 pi voted at T9 and provided with arollcr or wheel. 80 restingron the outer or upper side ol the belt. "lhese belt tighteners are mounted on thebcams' 24 and 25 and cat-h belt. tightc'ricr comprises also a bracket 81 having a set screw or adjusting screw 82 which touches theouter side of the arm 78 and enables the arm to be adjusted toward the. belt so, as to take up the slack of the belt as will bereadilynnder As indicated in FigL i'tings w 83 l which 2 :the rear barltl of the frame 9 I prim/ it e -c 'n'rcspond to the springs 45 on the forward ,"11 and th'ese springs cushion the rear I of the saw beams 24 and when they k come into their depressed position. Adjacent to these springs 83 thrust blocks 84 are 5 rovided similar to the thrust blocks 4-3 a'nd'these thrust blocks assist in talziugthe I thrust. of the saw as will be readilyunden sto'o'd. I p shall now describe the mode of operalQ ii onof'the saw.

' indicated in Figs. 1' and 3'. the saw mill is arranged to receive the log moving from lift to 'rigl'itns indicated by the arrow the line a-- -a in Fig. 1. As the logvaphejupp'er edge of the depressed saw 28, if the log is very large it will also enigage' the lower edge of the saw 29, both saws i being in the saine plane. In this connection 0- tt'enti'on is called to the fact that when the ""r oc'lri'ng frame is in an inclined position the 'loiver e'dg'e of the upper 'savv will be below the level of the upper edge of the lower saw. it when in'tl'iis position the toggle links 52 1"55' are flexed or broken at their joint 8 m; 1]7lVOl3 COIl1lBCtlOD 541-. The toggle links -16 an d47 on 'the other hand Will be extended nearly in line with each other and with the ""li vbt' pin48 slightly beyond the dead center tleeonnecting the bolts-'49 and 50. This flocks the' rocking framein this position ijthL-respeet to any forces acting directly tip'on therocking frame. .Inthis position the-rocking frame as soon as the segment 7'beeo'rnes disengaged from the teeth 60 of theraclr58, through the rotation of the "shaft (54, both saws will be continuously "driven in opposite directions as indicated by 'fthe arrows in Fig. 1. "passe'd' from the "left to the right and is to Eb'e" returned by movement in the opposite 1 "gtlireetion the rocking frame will be shifted -=anepposfte extreme position. This is acomplished through the medium of the shiftg cylinder 62 which slidesthe-raek58 to ardthe right. This movement of the rack o psraite's through the segment 51 to swing sth-e ""ggle joint at 48 inwardly and depresses th right side of the rocking frame After fif this r novement has continued a short time g nie'nt fi't so that the segmentb'l will opverate to elevate the left side of the rocking jranie through the operation of the toggle l'irik's .52 and 55. After this engagement takes place between the teeth and the segment 57, the segment 51 ;b&GO1D8S disengaged from'the teeth 69 andthey eventually assume thesame relation toward each other -as that illustrated between the segment 57 and the teeth 60. From this arrangement it will be seen that first one side of the rockihg frame is depressed and then the other, and in'both of the extreme positions the depressed saw beam issupported on its under rtjaches the saw it comes in contact with VYhen the log has I .Q'fllfittbll 60 come into engagementfivith the.

side by a block 42. Furthermore the rocking frame-is locked a ainst movement from the fact that the toggle links attached to its upper side are substantially in alinement. In this way the saw mill is made to cut on both strokes of the saw mill carriage which carries the log.

The guide 17 prevents any displacement or any longitudinal shifting of the shaft 18 in its bearings, and forms an efficient guide for the rocking frame. In this way I relieve the bearingposts 14, 15 and 16 of/dangerous strains actlng'ina horizontal plane tending ,to twist the rocking frame on a vertical axis.

Special attentionfis'called to the maimer in which the saw beams24 and 25 overhang at their'forward ends-beyond the planeof the guide rings 17. This produces a large clearance between the plane of the saw and the guide so as to permit 'timbersof large size to be cut.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is: v

1. A double acting saw mill comprising a main frame, a rocking frame mounted to rock thereu on on an axisv elevated above the path 0 the log, saws carried by said rocking frame, means for holding said .rocking frame-with either side. thereof depressed to pres in one of saidsaws in the patlrof the log'and the otherlof said saws elevated thereabove, a fixed thrust block below and disposed to one side of the axis of said rocking frame adapted to be engaged by'the depressed side of said ro'ckingframe to ab sorb the thrust of the log moving from the depressed end of said rockin frame in the direction of. the said axis of said rocking frame, and a fixed thrustbloek on the other side of said axis depressed therebelow, adapted to beengaged by the depressed side of said. rocking frame to absorb the thrust exerted by the log in moving in the opposite direction.

2. A double acting saw mill comprising a main frame having a horizontalframe bar extending substantiallyparallel to-the path of the log, a. rocking frame supported. on saldmain frame w 1th its ax s elevated. above the path of the log, saidro'cking frame having oppositely extending arm's, saws carried respectively at the ends of said arms, means for holding said rocking frame with either of said arms depressed so as to presentone of said saws to the path of thelog whilethe other of said saws is heldelevated above the path of the log, a spring mounted on saidbaradapted to be engaged by-the ends of said arm to cushion the downward swinging movementthereof, a'thrust blocl' mounted on said bar at the left side of the axis of said rocking frame and receiving the thrust of the log'passing from said-block toward said axis and a thrust block mounted frame,.means for holding said rocking frame with either side thereof depressed to present one or the ither of said-saws to the logyguards carried by said rocking frame 1n connection with said sane and fixed bracketsft'orming sockets receiving said guards when said guards are in theirde Dressed positions, said guards forming gui es for the saw blades, 4. A double acting saw mill, comprising a main frame, a rocking frame mounted'on said main frame, saws carried by said rocking frame, guards carried by said rocking frame adjacent to said saws and sockets fixed on said main frame and receiving said guards to secure said guards and-said saws against lateral displacel-uent, said guards being guides for said sawsi 5. A double act1n saw .mill com n'isin 2- b a mainframe, a rockingtrame rotatably mounted thereupon, saws carried by said rot-king i'rame, saw guards-carried by said rocking :l'ranie z'ul-yacentto"su1d-sa\vs and ail'ording' means for guiding the said hil mfil and fixed-sockets torm-ing'seats for said guards. p

-13. A double acting saw mill comprising a main frame, a. rocking frame rotatably mounted thereupon, saws earried'by said rocking frame, saw guards carried by said rocking frame adjacent to said saws and aii'ording iucans for guiding the said saws, fixed sockets foruiing'srats for said guards, and self locking means. for"holding-first one side'ot' the re. \"iug frame"depressed and then the other side thereof depressed. 7'.L\ double acting saw mill comprising a i i'inr' 'ua rocking il'rauie mounted there 1 u, ii \'\"s carricdby said 'rockil'ig frame, togglelinks coni'iccte'd with oppositesidesof said i'm-kiu imraml adapted to lock said 'l'rame irheu xtondi d' and means for actuatiug saidd a links to depress eitl'i'erside of said winkingframe, i 4 I i. double flaclziug sa mill comprising a iuai'u iii-"hue, a rock I g Frame mounted 'tliyrcupim i s carriedthereby, a pair of. toggle links attached on one side of said rocking Frame, a second pair of. toggle. links attached on the other side of said rocking- I frauu a ul n -ans for a'uluatingeither pair of said toggle links and arranged sons to become:diseugaged from. one pair "of said links to permit an extreme movement of that pair of links.

9. A double acting saw mill comprising a main frame, a rocking frame mounted thereupon, saws carried thereby, a pair of toggle links attached to one side of said rocking frame, a pair of to gle links attached to the opposite side 0% links respectively and. adapted to actuate the same, a rack adapted to engage said segments for actuating said links to depress --first one side of said rocking frame and then the, other side thereof.

10. A double'acting saw mill comprising a mainframe, a rocking frame mounted thereupon, saws carried thereby,.a. pair of toggle linksv attached to one side of said rocking frame, a second pair of toggle links attached to the opposite side of sa d rock ing -f1'a1ne,-segments in connection with said linksrcspectively for actuating" the same, a

rack mounted to slide adjacent to said segments and having two sets of teeth for operating saidsegments, said rack being arrangedso that the set of teethadjacent to the depressed side of said frame becomes disengaged from its segment to'permit an extreme movement of the toggle links ad jacent thereto. i

A saw null having a main frame, a

521W httIlIQ-JYIQYHbly mounted thereupon, a saw spindle rotatably mounted. in "said saw mile, a 1 saw adapted to be attached to the end-of said spindle, a saw guard rigid with said sawframe and having a -removabl'e guard plate on the outer side of said saw, a socket receiving said guards when depressed.

saw mill having a main frame, a

rocking frame mounted upon said main' 'irame, a guide for said'rocking frame disposed in a plane substantially at right angles to the axis of rotation of said rocking frame, I

said saw frame having parallel overhanging beams extending beyond said guide, spindles said rocking frame, segments in connection with sald.

extending along said beams and havlng'a plu-inlity of bearings thereupon; and 'saws- 'catr ed'by the ends of said spindles 1n-'a;.

plane removed from said guide whereby a clearance space is formed forthe log behave hereunto subscribed my name this l3th day of l)ece1'nber,1909.

WILLTAM 'r. BRIDGES. Witnesses F, I). 'AMMEN,

EoMoNn A. STRAUSE.

v tween the plane of the saws and Sflldgllldl'. J P In witness that I claim the fOIGgOIIIgI 

